After loading music on my iphone it no longer appears in my phone after using itunes match.

10-11  Source: Network gathering  Views:0 

Meaning, I loaded music to listen to offline. Later in the evening I used itunes match so that I could acees my library from my phone while on a friend's wi-fi. When I switched back to listen offline, all of my songs were gone. Not only that, but they were replaced by songs that keep appearing in my playlists even after I delete them.
Can I get a little help? I love itunes match, but hate this part of it.
I had this problem.  I held down the power switch to power down completely.  Takes a few seconds.  Then use the power switch to turn on.  Might take a couple goes.
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